I was looking for a case that could be transported on my back, so I would have free hands to take other guitar stuff. And I also wanted something that would provide the same level of protection to the electric guitar as the hard shell has been providing to my acoustic for years already.
This "soft case" from SKB fulfills both my requirements, since it is lightweight and portable like soft cases, but with inner design and protection like hard shells.
Standard Fender Stratocaster fits perfectly (with tremolo arm detached), together with few sets of strings, cable and strap.
I have been using it to transport my guitar several times per week for over 4 months and no sign of wear till now.
The only drawback I see is that it is not possible to fit an A4 sheet in the front pocket. The pocket is too small for this size of sheet.
So in a nutshell:
Lightweight, backpack-like with hard case properties (protection level, inner design). The front pocket can not accommodate A4 sheets.